Foot stool



FIG. 1 is a front view of a foot stool showing my new design, the rear view being a mirror image thereof;

FIG. 2 is a left side view thereof, the right side being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a front right perspective view thereof. 

CLAIM The ornamental design for a foot stool, as shown and described. 